Senior Fullstack Software Engineer (Digital Identity / EBSI / Blockchain)) (m/f/n)

This role is for a European Union Organisation based in Belgium involved in large-scale initiatives supporting digital transformation of public services across Europe, specifically in areas like Digital Identity, Web3, Blockchain, and the European Blockchain Services Infrastructure (EBSI).

• University degree (minimum Bachelor's or Engineering degree) in Computer Science, Software Engineering, Electronics, Mathematics, or Physics.
• English proficiency at minimum B2 level (CEFR) with excellent written and verbal communication skills.
• Ability to effectively communicate with both technical and non-technical stakeholders in an international environment.
• Minimum 10 years of experience in Full Stack Software Development using JavaScript/TypeScript.
• Minimum 3 years of hands-on experience with Web3 and Blockchain-based applications.
• Minimum 2 years of experience implementing Decentralized Identifiers (DID), Verifiable Credentials, and Digital Identity Wallets.
• Minimum 2 years of experience designing and implementing Smart Contracts on EVM-compatible blockchain networks.
• Minimum 2 years of experience designing, developing, and securing RESTful APIs and web services.
• Minimum 2 years of experience working with blockchain-based tokenisation solutions.
• Minimum 2 years of experience delivering projects within the public sector or European institutional environment.
• Minimum 8 years of experience working in Agile/Scrum environments on complex, multi-stakeholder projects.
• Technical skills: Backend with JavaScript, TypeScript, Node.js, NestJS, Bun; Frontend with React, Next.js, React Native, HTML5, CSS3, Webpack, Vite; APIs and Security including REST APIs, OpenAPI, OAuth 2.0, OpenID Connect, JWT, mTLS, OWASP; Databases such as PostgreSQL, MySQL, MongoDB, Flyway; Blockchain and Web3 including Solidity, OpenZeppelin, Hardhat, Foundry, ethers.js, viem, ERC-20, ERC-721, ERC-1155, UUPS, Transparent Proxy, Diamond Pattern; Digital Identity technologies like DID, Verifiable Credentials, EBSI, eIDAS 2.0, OpenID4VP, OpenID4VCI, SIOP v2, EUDI Wallet; DevOps and Cloud with Docker, Kubernetes, GitLab CI, Jenkins, ArgoCD, SonarQube, AWS, and Azure.
• EU citizenship and work from within the EU required.
• Submitted CVs must be provided in Europass format.

• Design, develop, test, and maintain full-stack software solutions.
• Build modern, responsive user interfaces using React and Next.js.
• Design and implement backend services and RESTful APIs.
• Develop and integrate Web3 and blockchain-based solutions.
• Design, implement, and maintain smart contracts on EVM-compatible networks.
• Build and integrate decentralized identity solutions, including DID and Verifiable Credentials.
• Integrate systems with European digital identity and trust-service infrastructures.
• Implement secure authentication, authorization, and cryptographic mechanisms.
• Develop automated unit, integration, end-to-end, performance, and security tests.
• Contribute to CI/CD pipelines, DevSecOps processes, and cloud-native environments.
• Translate business and technical requirements into scalable and maintainable software solutions.
• Produce and maintain technical documentation.
• Collaborate with architects, DevOps engineers, security experts, product owners, and other stakeholders.
• Ensure compliance with security best practices and software quality standards.

EU citizenship and work from within the EU required. Services must be performed from within the EU.